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Editorial Team
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Asked: 2026-06-07T23:53:20+00:00

Background: In the process of creating an android application, I am messing around with

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Background: In the process of creating an android application, I am messing around with different hashing techniques and speeds. I was using the Android native stuff until I found SpongyCastle ( i.e. BouncyCastle ), which turned out to be a lot faster. The SpongyCastle .jar file is fairly large, and my .apk is over 800kb with just the jar and a couple of testing classes ( and all of the necessary android fluff).

Question pt 1: Is this normal for .jar files to do to an APK? Do they usually bloat out the file?

Question pt 2: Is there any way for me ( either via source or jar ) to cut down the file? I’m only using the SHA256 and SHA1 hash schemes, and I have not been able to figure out how to use just those two hash schemes without including the entire jar.

Thoughts?

Edited: ProGuard works wonders.

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  1. Editorial Team

    Use ProGuard. It excels at trimming down parts of dependencies that you don’t use. It’s specifically mentioned for use on Android applications here.

    (I contribute to Guava, which is a pretty big library, but a lot of people want to use it for Android. We point them to ProGuard.)

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